Security Architecture
Built on Zero-Trust From Day One
MXend assumes no inherent trust — not between servers, not between senders, and not even within our own infrastructure. Every layer of our platform is engineered to verify, encrypt, and protect your communications against both current and emerging threats.
Our Security Principles
Four foundational tenets govern every architectural decision, feature implementation, and operational procedure across the MXend platform.
Never Trust, Always Verify
Every request is authenticated and authorized regardless of its origin. Internal services, external APIs, and user sessions all undergo rigorous identity checks before any action is permitted.
Defense in Depth
Multiple overlapping security controls ensure that the compromise of any single layer does not expose sensitive data. From network segmentation to application-layer encryption, every boundary is fortified independently.
Least Privilege Access
Services, users, and automated processes operate with the minimum permissions required. Access is scoped by role, time, and context — and revoked the instant it is no longer needed.
Assume Breach
Our architecture is designed as if a breach has already occurred. Blast-radius containment, real-time anomaly detection, and automated isolation ensure that even a successful intrusion cannot propagate.
Identity Verification Pipeline
Before a single email is sent, every MXend user passes through a rigorous four-stage identity verification process that binds a real-world identity to a cryptographic key pair.
Government ID Scanning
Users submit a government-issued photo ID — passport, driver's license, or national identity card. Our automated document verification engine validates authenticity, detects tampering, and extracts identity data in real time using NFC chip verification where available.
Biometric Facial Matching
A live selfie is compared against the submitted ID using 3D liveness detection and anti-spoofing algorithms. Our facial matching engine achieves a 99.97% true-positive rate while rejecting presentation attacks including printed photos, screen replays, and silicone masks.
Multi-Factor Authentication
After identity confirmation, users configure hardware-backed MFA using FIDO2/WebAuthn security keys or platform authenticators. TOTP and SMS are supported as secondary options but are never the sole authentication factor for high-privilege operations.
Continuous Re-Verification
Identity is not a one-time event. MXend performs periodic re-verification checks, adaptive risk scoring on every session, and step-up authentication for sensitive actions such as key rotation, account recovery, or administrative changes.
Encryption at Every Layer
MXend employs a comprehensive encryption strategy that protects your data whether it is moving across networks, resting on disk, or being read by the intended recipient.
In Transit
- TLS 1.3 enforced on all connections — legacy protocols disabled
- Perfect forward secrecy via ephemeral X25519 key exchange
- Mutual TLS (mTLS) between all internal microservices
- DANE/TLSA DNS records for authenticated TLS with receiving servers
- Certificate Transparency monitoring for domain integrity
TLS_AES_256_GCM_SHA384 · X25519 · ECDSA P-384
At Rest
- AES-256-GCM encryption for all stored messages and attachments
- Hardware Security Module (HSM) backed master key storage
- Envelope encryption with per-message data encryption keys
- Automatic key rotation on a configurable schedule
- Cryptographic shredding for guaranteed data deletion
AES-256-GCM · HKDF-SHA256 · FIPS 140-3 Level 3 HSM
End-to-End
- Client-side encryption before data ever leaves the sender's device
- Zero-knowledge architecture — MXend cannot read your messages
- Only the intended recipient holds the decryption key
- Forward-secure ratcheting protocol for ongoing conversations
- Post-quantum key encapsulation (ML-KEM) available in preview
X25519 · Ed25519 · Double Ratchet · ML-KEM-768
Mutual TLS Authentication
Standard TLS only authenticates the server. MXend goes further by requiring both parties to present and verify X.509 certificates before any data is exchanged.
In a traditional TLS handshake, only the server proves its identity to the client. This leaves the server unable to cryptographically verify who is connecting to it. Mutual TLS eliminates this asymmetry by requiring the client to present a valid certificate as well — creating a bidirectional chain of trust.
MXend enforces mTLS across every internal service boundary and offers it as an option for enterprise customers connecting via API. Each service is issued a short-lived certificate from our internal Certificate Authority, automatically rotated every 24 hours, with revocation enforced via OCSP stapling.
For inter-domain email delivery, MXend combines MTA-STS policy enforcement with DANE/TLSA records to ensure that messages are only delivered over authenticated, encrypted channels — preventing downgrade attacks and DNS hijacking.
Protocol: TLS 1.3 Key Exchange: X25519 Cipher: AES-256-GCM Certificate: X.509 with OCSP Stapling
Your Data, Your Jurisdiction
MXend operates region-locked data centers across North America, Europe, and Asia-Pacific. You choose where your data lives — and it never leaves that jurisdiction without your explicit authorization. Every byte is encrypted, every access is logged, and every transfer is auditable.
GDPR
Full compliance with the EU General Data Protection Regulation. Data Processing Agreements, right to erasure, and data portability built into every account.
HIPAA
BAA-ready infrastructure for healthcare organizations. PHI is encrypted at rest and in transit with audit trails that meet HHS requirements.
SOC 2 Type II
Annual third-party audits verify our security, availability, processing integrity, confidentiality, and privacy controls meet AICPA Trust Services Criteria.
ISO 27001
Certified information security management system covering risk assessment, access control, cryptography, and operational security across all environments.
CCPA
California Consumer Privacy Act compliance with transparent data collection practices, opt-out mechanisms, and automated data deletion workflows.
Infrastructure That Never Sleeps
Our security operations run around the clock, combining automated threat intelligence with human expertise to defend your email infrastructure against the full spectrum of cyber threats.
Real-time Threat Detection
Machine learning models analyze email metadata, behavioral patterns, and network telemetry in real time. Anomalous activity triggers automated containment within milliseconds — before threats can escalate.
Automated Incident Response
Pre-defined playbooks execute automatically when threats are detected. Compromised sessions are terminated, affected keys are rotated, and forensic snapshots are preserved for post-incident analysis.
24/7 SOC
Our Security Operations Center is staffed around the clock by certified analysts who monitor alerts, investigate anomalies, and coordinate response efforts across all regions and availability zones.
Penetration Testing
Quarterly penetration tests conducted by independent red teams probe our infrastructure, APIs, and client applications. Findings are remediated within SLA and verified through retesting.
Bug Bounty Program
Our public bug bounty program rewards security researchers who responsibly disclose vulnerabilities. Critical findings are triaged within 4 hours and patched within 48 hours of confirmation.
Disaster Recovery
Geo-redundant backups with a 15-minute RPO and 1-hour RTO ensure business continuity. Automated failover, encrypted backup replication, and quarterly disaster recovery drills protect against catastrophic scenarios.
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